laser产生的Betatron辐射的同步加速器型光谱的证明
Demonstration of the synchrotron-type spectrum of laser-produced Betatron radiation
摘要：
在激光等离子体加速器中，当电子在激光尾流场中被加速和摆动时，产生了Betatron X射线辐射。利用10 ~ 100太瓦的高功率激光，在不同的相互作用机制下观测到了这种飞秒源，它产生的强X射线束在几千电子伏范围内。然而，所进行的光谱测量都没有足够的分辨率、带宽和信噪比来精确地确定单次激光发射的光谱形状，以避免发射到发射的波动。本文用单光子计数法对80 TW激光产生的Betatron辐射进行了表征。我们测量Single Shot光谱从8到21 keV的分辨率优于350 eV。所得到的结果与理论预测非常一致，并证明了这种辐射机制的同步加速器型性质。在我们的实验条件下，临界能量为Ec = 5.6 \pm 1 keV.此外，在这个能量范围内的源的功能打开新的前景，在时间分辨X射线科学的应用。
英文摘要：
Betatron X-ray radiation in laser-plasma accelerators is produced when electrons are accelerated and wiggled in the laser-wakefield cavity. This femtosecond source, producing intense X-ray beams in the multi kiloelectronvolt range has been observed at different interaction regime using high power laser from 10 to 100 TW. However, none of the spectral measurement performed were at sufficient resolution, bandwidth and signal to noise ratio to precisely determine the shape of spectra with a single laser shot in order to avoid shot to shot fluctuations. In this letter, the Betatron radiation produced using a 80 TW laser is characterized by using a single photon counting method. We measure in single shot spectra from 8 to 21 keV with a resolution better than 350 eV. The results obtained are in excellent agreement with theoretical predictions and demonstrate the synchrotron type nature of this radiation mechanism. The critical energy is found to be Ec = 5.6 \pm 1 keV for our experimental conditions. In addition, the features of the source at this energy range open novel perspectives for applications in time-resolved X-ray science.
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